Machine for cutting spirally grooved cams



Aug. 9, 1932. E. J. GRUENEWALD MACHINE FOR CUTTING SPIRALLY GROOVED CAMSFiled June 23, 1951 5 Sheets-Sheet 1 Aug. 9, 1932.

E. J. GRUENEWALD MACHINE FOR CUTTING SPIRALLY GROOVED CAMS Filed June23. 1931 5 Sheets-Sheet 2 Aug. 9, 1932. v E. J. GRUENEWALD 1,871,174

MACHINE FOR CUTTING SPIRALLY GROOVED CAMS Filed June 25. 1931 5Sheets-Sheet 3 Aug. 9, 1932. E. J. GRUENEWALD MACHINE FOR CUTTINGSPIRALLY GROOVED CAMS 5 Sheets-Sheet 4 Filed June 25. 1931 i MIL E li''lllll llllllliil llll ll n Aug. 9, 1932. E. J. GRUENEWALD MACHINE FORCUTTING SPIRALLY GROOVED CAMS Filed June 23. 1931 5 Sheets-Sheet 5Patented Aug; 9, 1932 entree m-es EUGENE J. GEUENEWALD, 0F LAFAYETTE,INDIANA, nssrononfro Boss GEAR sac;

TOOL COMPANY, or LAFAYETTE, INDIANA, A conroRA'rIoN or INDIANA macmnnroacur'rmo sPIRALLY enoovnn onivrs Application filed June -23,

The object of this invention is to. provide a novel machine for cuttingspirally grooved cams or actuating members such, for eX- ample, as areemployed in theso-called Ross cam and lever steering gears such as shownin Ross Patent No. 1,567,997 dated'December 29, 1925. i

The present invention provides a machine in which the blanks to be outcan be readily positioned on a horizontally disposed work table beneatha vertically disposed rotatable cutter which operates upon the camtocutthe groove therein. During the cutting operation the tableis given anarc'uate movement which is controlled byareciprocable table to move onthrough its arcuate path at any desired rate of speed during the cuttingoperation so as to producelnthe cam a groove which may be variedin pitchas may be desired. In cams for the Ross gears the groove varies in pitchfrom center toward each end thereof and also varies in depth.

The mach ne forming the subject matter of the present inventioncomprises (1) a horizontal work table upon whichzthe blank mountedan'drotated at a constant speed during which time. thesaid table has(constant or intermittently variable) arcuate travel beneath, and inrespect to a longitudinally and transversely immovable, ro-

tating cutter; and (2) vertical rotatable spindle carrying a millingcutter and mechanism for operating same, the said vertical head beinglongitudinally, and transversely immovable but vertically variable withrespect to the table. These two mechanisms are built on common mainframe or base and are interconnected by a common main drive, to whichpower is applied at aconstant rate of speed the speed of the cutter spine being considered as constant during the cutting operation; but thespeed at which the blank is rotated during the cutting operation may beaccelerated or retarded by the use of change gearing; also the speedatwhichthe work table makes its arcuatetravel being under the control of amaster cam may be constant or be variable as required. To enable othersto clearly understand and which is fixed a bed plate 1a; upon which isslidably mounted a movable table 2 which transmitted from said shaft tothe work table 1931. Serial No. 546,321. 6

use the invention the samelwill be described connection with theaccompanying draw- -1ngs formingpartof this specification and is anelevation of the complete machinelooking from the rear, and showingapart sec,- tion throughthe frame along thecenter'line 'of the verticalfeed drive shaft. Figure 4is 5 master cam, which is shaped to cause thetable taken, just above the plane of the link gears 6 showing in fulllinesthe position of? parts at the beginning of an operation and in Vdotted lines in'the position assumed at'the' end of an operation. Fig. 6is a detail'top planof parts inthe housing 10 the cover being.,removed.7 is a deta-i'lisectional view of a' spindle clamp. ig; 8 is .a detailsectional view of the devices for'"vertically adjusting the spindlesupport: f

The machine shown comprises abase l on' carries the mechanismforsupportingl and rotating' the blank to be cut. Upon this bed v105 isalso mounted avstandard 1b, which is preferably arched for strength; andon this standard above the bed is mounted a housing 10 in-whioh aremounted the main driving shaft and gearing by which motion is actuatinggearsyand to the cuttercarrying spindle, which is guidedin a sleevemounted in vertically disposed casing 1d on the fram below the housi g,a

' On the'table 2 is mounted a head stock 3 and a tail stock 350, thesebeing axially l aligned, the tail stock having a slidable spindle 32which can be moved in or out to engage or disengage the slot in the endof the ca'm blank'B by means'ofa hand lever-'32 plvoted .on thetable andoperable inth-e'usual 3' manner. The head stock 3 has a spindle 3arotatably mounted therein and a blank 13 to be cut into a cam issupported by and between the adjacent ends of the spindles 3a and 83 K(see Figs. 1 and 2).

Figs. 1, 2- and Shaft'iie'is driven as here inafter described. Onthelower end of shaft 7 3a is mounted a helical gear Sfwhich meshes witha helical gear 39 on -acounter shaft 3h j ournaled in hearings in acasting 22 on table 2'adjacent head stock The shaftBh carries a pinion3i -meshing with an ,interinediate p1-n1on'3jm0unted-on astud 370..Pinion 3j also meshes with a pinion la on a lead screw shaft 4 which isjournaled' in bearings in acasting 22 attached to the underside andouter end of the table 2 (see Figs. 2 and 3) The lead-screw 4 isaxially'immovable but is rotatable in its bearings in the casting 21 andengages'a nuts?) ona'slide 40 which is guided in a groove in the casting2y in. which groove the slide to can be moved back and forthtransversely with respect to the longitudinalcenter of the table 2, themovable slidebeing dependent on the rotation of the t lead screw4. 0nthe upper side. of the slide ao'issecurely fastened a master cam 4e (seeFig. 2), said cam having an outer inclined cam surface or edge 4f whichengages a roller (5a onthe underside of a slide 5 which isarrangedbeneath and longitudinally of the table 2 and may be guided in aslot in the upper side of casting 2 (see Figs. 2 and 3).

4 To theslidefi is connected a rack bar 56 the. table 2 and the rackmeshes with two link which extends longitudinally of and beneath gears 6whicha re spaced at a'convenient distance apart and located between thebed plate 1a and the table 2; being-preferably disposed in'alongitudinal groove in the underside of table 2. 1 I The peripheries ofthe" link gears have no contact with the sides of the aforementionedgroove but a means of adjustmentto maintain a proper sliding fit for therack is provided byqa gib 2Q), this adjustment being made after linkgears Gare in-Jtheir'correct posi tions. Each link-gear 6 has two studs6a and 6b, integral 'or inserted as desired. One stud 6a (Fig. 4) islocated on the radial centerqof the'pitch diameter of the gear; andtheother stud 66 (Fig. 4) is located at a distance from 7 this radialcenter equal to the radius of the are on the cam it is desiredtoproduce. The complete link gear assembled has thenthe appearance of acrank with spur gear teeth 2 V at the periphery-of a circular disc.

The underside of'the table 2 has a'longitudinal dovetail groove in it,situated above that in which the' link gears and-rack arelocated,

and secured'in this groove is a pivot plate 6c (Fig. l) in which arearranged two bearings 66 with which the studs 6a of the link gears areengaged. In the upper surface of the bed 1a is a groove in which is alink plate 6f (Fig. 4) held between the gibs ls. In this said link plateare two'be'arings 6g With which the stud 66, previously mentioned areengaged. These bearings are accurately spaced and are so located withrespectto the common longitudinal center line'of both pivot'and linkplates as is required by the relation of the center of the requiredarc(to be described by the mill-- ing. cutter to the longitudinal centerline of the steering gear cam blank B, as will be seen in Fig. 2.(seeFigs. 1 and 2) I Y and to maintain contact betweenthe roller 511. l andmaster cam 4; when the cutter is engaged springs or weights maybeemployed; pref-.

erably aweight 5w is suspended by achainfiv running over a. pulley 5a,mounted on the base and connected to the adjacentend of the carriage 2?(see Fig. .During thecutting operation as-the table is moved the weightis raised. V

Ifdesired a reverse cam 49 may be mounted on the slide 450 opposite thecam ie to keep the roller 5a positioned, but it is not necestrols thespeed and direction of rotation of the shaftge, the'shaft sections 3mpermitting thevarcuate movement ofthe work table with respectto the"laterally immovable shaft 7,"as hereinafter described.

' The shaft 7 is rotatable in fixed bearings sarylto have the cam 49conform to the proin the topand base of thehousing 1c and To'take up anylost motion in the linkage upon this shaft near the upper end thereof isrotatably mounted a pinion 7a, a gear 7?) and 'a beveledgear 70.. Thesemay beformed integralor fixed so as to rotate as unit and preferably abushing 7cZ'is interposed between these gears and the shaft 7. On theshaft 7 below bevel gear 70 is a similar bevel gear'7e loose upon'theshaft,ibut interposet between'the bevel gears 70 and 7e are pinions J7meshing with both bevel gears 70 and 76', the pinions 7 f beingrotatable upon studs 79 mounted in a bearing 10 supported on a .bracketlp in housing lc. The pinions 7 7 cause the gears 7 c and 7 e to rotatein opposite direction around the vertical shaft .7.

The bevel gear 76 has a clutch face 7h on its lower side adaptedtoengage opposed clutch face. 8a on a doubleclutch member 8 which iswhen clutch 8 is engaged with gear 7 e rotation is-imparted from gear76' to shaft 7.'

Rotatably mounted on shaft 7 below the clutch 8. is a gear 9 of largerdiameter than gear 7?), and provided with a clutch face 9a which isadapted to beengaged with an opposed clutch face 86 on the lower side ofclutch 8. The gears 7 e and 9 are so spaced apart that when the clutch 8is disposed eX- actly-intermediate these gears it will notbe engagedwith either gear 7 e or 9,'but by raising clutch 8 it can be engagedwith gear 7e, and by lowering clutch 8 it can be engaged 'withgear 9.

The clutch faces 9a may be formed on gear 901" on a bushing 96 splinedin the hub of the gear as shown in Fig. 3. Gear 9 meshes with a small.pinion 9c ona stud 9d on the lower "part of the housing 10 and pinion 90is formed with or rigidlyconnected to the hub of a larger gear 96 whichin turn meshes with a pinion 9/ on a vertical shaft 99 journaled inthe'housing 10 parallel with shaft 7 and on the upper end of shaft 9g isa gear 9h which meshes with a smaller gear. 9i on a stud shaft 9fjournaled in the top of the housing 1c, and onthe lower end of the stud9f is a gear 970 which meshes with the small pinion 7a loosel mounted onshaft 7 as above described.

' The gears 92', 9h -may be movable and changeable so that by changingthese gears the relative speed of the forward and reverse ate positionbut may be raised or lowered at will. As shown it has a groove engagedby a yoke 80 on a shaft 861 journaled in the hous ing lc'parallel withthe shaft 10, but at the opposite side of the shaft 7 the shaft 8d maybe operated by a hand lever 86 (Figs. 1 and 4:), and is alsoautomatically operated upon the movement of the table 2 to eitherextreme limit. Forthis purpose anarm 8f on the shaft 8d (see Fig. 1) isconnected by a link 89 to an arm 8h on a rock shaft 8?? journaled in abracketlu attached to the standard 16 (Figs. 1 and 2) and on shaft 85are fixed two depending trip fingers 8y and 87 0 which are respectivelyadapted tobe engaged by lugs '8Z'and 8m respectively on arms 3t and 3sfixed on the outer end of the spindle 3a (see Figs. 1 and?) I As thetable 2 nears the'extreme limit of its inward movement to the right inFig. 1) the lug 8Z engages the finger 87c and causes the clutch 8b todisengage gear 9. As the table reaches the extreme limit of its outwardmovement (to the left in Fig. 1) lug 8m will bearings in the bracket 1d.

' 'The engage trip finger 8'y' andcause clutch 8a to disengage gear 76.

Thus the table 2' will be automatically disconnected from the driv- .ingshaft 7 at the end of the limit of movement of the table tov right orleft.

On drive shaft 10 is a bevel gear 100 which 1 meshes with bevel gear 110"slidably keyed on the cutter spindle 11 which is rotatably journaled inbearings 11a and 11b in the upper and lower ends ofa verticallyadjustable sleeve 12, which is slidably guided in an upper bracket 12'and a lower bracketor head 1d attached to the side of the standard 1?)(seeFigs. 1 and 4t). a

i The spindle 11 is provided at its extreme lower end with a. millingcutter C. Any-suit able means (indicated at 118) for detachablyattaching the milling cutter to the spindle 7 maybe used. I V I a r I TThe sleeve 12 is providedfwith a rack 12a on its front face whichengages a small pinion 13ajonfa shaft 13 iournaled in suitable On theouter end of "the shaft 13 is a worm gear 136 which meshes with aworm130 on a stub shaft, 13d journaledin a housing 170 attached to'thebracket 1d and operable by a hand wheel13e (see Figs. 1,-4-a-nd 8). Thesleeve 12 and ered' by turning the hand wheel 13c, and by said devicesthe cutter can beaccurately,

ably. graduated dial. 13;" attached to the housing 17c 123 (Fig; 4)which may be clamped thereto intermediate the brackets 1d and 12'. Afterthe sleeve andcutter areadjusted to proper,

lowermost position by means of the worm gearing above described, thestep 128 should be adjusted into contact with the top' of the bracket 1dand then firmly clamped to the sleeve. Thereafter the sleeve with thespindle and cutter can be quickly raised when desired without having toback-upor disturb the adjustment of the wormgearing 18a, 13 0 130;

spindle 11--can be manually raised and lowa r ,100 sleeve 12 may beprovided witha stop and can be quickly restored and arrested'in correctoperative position by the stop 12s;

14a (see Figs. 1, 4 and 7 The spindle 11 carries a flywheel to eliminatevibration; a

flywheel 11w being shown'on the upper end of the spindle. Q

. pemtz'on The blanks B to be grooved should be ap- 1403 connected by'ascrew operable by a handle i proximately cylindrical and provided at oneend with an axial recess to engage the taperedv a endof thetailstock'spindle 33/, and at its other end with a similar recess toengage the tapered'end of the headstockspindle 3a, and

inaddition this end time blank should ibe f providedwith an offset slotto engage akeyfib (Fig. 2) 'onthe end .ofthe spindle 3a, so that whenthe blank is positioned between the spindiesSa and 3; as shown it can berotated by and with the spindle; 3a." The'slot and key 36 provide asimpleand eflective mannor of rotating the blank with the spindle 8a,

but other means for rotatably engaging the blank with the spindle couldbe used if desired.

In Fig. 2 the table 2 is shown at'about mid-position of itsmovement,;but at the beginning of a blank cutting operationthe bedshould be moved fully to the left sothatthe roller 5a would be oppositethe smaller end of the cam 4e. During thecutting operation the slide 40is moved towardthe gear 4a; and the table 2 is moved toward the rightFig. 2) but also has a lateral arcuate movement imparted thereto by theaction of the link gears 6. r

' Whenthe table'2 is at the its outward movem'ent, and before starting.an operation the clutch 8 would be disengaged from both gears 76 and 9,and the controlling lever 86 would beinneutral'position,

(marked N-) as indicated in 'Figlt, and

the. inner end of the tailstock be adjacentjthe cutter spindle. While inthis position, blank Bis inserted between the spindles 3a and 3;],whilethe latter is retracted and the .slotted end of the blank engaged withthe key 37). and then the spindle 33 engaged with the other "end of theblank so asto supportthe same between the spindles as indicateddn Figs.1 and 2. After the blank is positioned the sleeve and spindle arelowered to enter the cutter G into a radial hole previously formed inthe blank, and as soon as the machine is started thecutter is rotated bythe gearing between thespindle'and the shaft 1O above described. I F

The starting lever Se is then moved over y to the left or the forwardposition, F (see Fig. 4) which causes clutch 8 to engage gear Sandthereupon rotation is impartedfrom the drive shaft through the gears'Fb, 7 a, 97s. 9i, 97L, shaft 9; gears 9/. 9e, 90 and: 9 and clutch 8 tothe shaft 7 and then ce-through the universal joints 3mto the shaft ofthe table drive assembly. From shaft 3 a slow rotary motion is impartedto theblank through gears 3d, 30 and headstock spindle 3a and also slowmotion is simultaneously i1nparted to slide 40 through the train ofgears 3f, 39. 35,3j. 4a, and lead screw hand as slide 40 moves to theright (Fig. 3) cam 46 engaging roller 5a moves the slide 5 and rack bar56 to the left 2) and actuates link gears 6 which throughthe stud 6a,Gb'cause the table 2 to move on an arc and carry the blank through asimilar are (indicated bythe arrow Z3, Fig. 2) with respect to thecutter C which rotates on a fixed center. Thelink and 76 cause areverserotation of the shaft 7 gears 6 are. so; designed that the-arcZ3whas a radiusae ualfto the distance'between'the centers of tie adjacen't studs 6aand 6b. The speed of rotation of blank Bis-soregu latedwith regard to the. arcuate movement" 1 of the table andblank beneaththe cutter that 7 during the cutting operation a spiral groove is cut inthe blank from one end to the other. =When cutting cams" for theso-called Ross- I cam-andlever-steeringgears, the arcuate movement ofthe blank relative to the cutter is such that the spiral groove cut inthe blank will vary in pitch and depthfrom -the center toward each endthereof, but Idonot consider-the invention limited to suchvariantgroovesfand by varying the relative dim'ensions and arrangementsof thelink gears and .studs the arc canbe made greater or less, or the arcuatemovement 'might be deepened when it isdesired to cut a straight unvary--ing spiral groove in the blank.- extreme end of When" the desiredgroove has been'cut in the blank; the table 2 will have about'complet-.ed its movement to the right (Fig; 2) ,and the tooth 8i on dog 3s willengage trip finger 870* and throw the clutch 86 out of engagement;

with the gear 9. Lever 86 can then be moved to reverse position R (seeFig. 4) which will engage. clutch 8a with gear 76 which: will produce areverse rotation of the shaft 7'and consequently of the table 2 andslide 4'0, through the gearingabove described untilthe the master cam.47. As the tablereaches its initial starting position the dog 8m onspinconnections disengages clutch So from gear dle 3a engagestripfingerBjand through its;

7 e, the lever 'S'e-beingreturned to neutral? position. V V

The contour of the master cam 46 can be varied, but for making'cams .for'steering gears the master cam should be so formed as '"toimpart-longitudinal: travel to the rack 56 inthe manner and timerequired to make the link gears 6 move the table on an arc of equalmagnitude to that of the required steering gear cam,-w1th1n suchtransverse travel of table 2 as the constructionof the parts willpermit." Various combinations of ratios may be produced in themastercams, and progressions may be made from each combinationof g ratios byvarying the gears 371,3j and 4a. 7

. In Figs. :1 to l the cutter spindle is shown locked at the desireddepth and with the cutter operating at the center-of the blank;

the table'is shown atit's intermediatepo "sition but'with'the startinglever and clutch at neutral consequently the feed is disen'-- gaged. InFig.,5 thework table shown in section, in a plane level with thetopofthe link gears and the link gears, rack,

master cam for moving the table in an arcuate path during thecuttingoperation, the means or moving the table'in an arcuate pathcomgaged with the table and a relatively efixed member, and a rackmounted on the table and engaging said link gears. I 2. In a machine forcutting spirally grooved cams or the like, a table for supporting theblank to be cut, means for rotating the blank during the cuttingoperation, means controlled by a reciprocable master cam for moving thetable in an arcuate'path during the cutting operatiom'arec1pr0cable'sl-1de carryingthe master cam, a lead screw for op eratingthe slide, and-reducing gearing foroperating the lead screw. r

3. In a machine as set forth in claim 2,

the means for moving the table in an arcuate path comprising spaced linkgears having studs engaged with the table and a relatively fixed member,table andengaging said link gears.

4C. In a machine for cutting spirally grooved cams orithe like, a tableforsup porting the blank to be cut, means forr'otating the blankduring-the cutting opera"- tion, and means for moving the table in anarcuate path during the-cutting operation; a shaft disposed above thebed, a connection between said shaft and the bed driving and blankrotating mechanisms, a slow train of gears and a fast train of gears fordriv ing the shaft in opposite directions, and means whereby'eithertrain may be operatively engaged with or disengaged from the said shaft.

5. In combination with the mechanism as set forth in claim 4, tripmechanism substantially as shown and described whereby the trains ofgears are automatically disengaged from said shaftv at theend of eachstroke of the table. I i j '6. In a machine for 7 cutting spirallygrooved cams or the'like, a table for supporting-the blank to be cut,means for rotating the blank during the cutting operation, andmeanscontrolled bya reciprocable master cam for moving the table in anarcuate path during the cutting operation; a. shaft I machine forcutting spirally grooved cams or the like; a table for supf portingtheblank to becut, means forro tating' the blank during 1 the cuttingoperation, means controlled by a -reciprocable' disposed above the bed,a connection between i said shaft and the bed driving and'blankrotating'mechanisms, a gear: rotatable in one direction mounted on saidshaft, a slow train of gears and a fast'tr'ain of gears driven from saidrotatable gear, and clutch mechaj nism whereby the fast train or theslow train may be operatively engaged with the said shaft toactuate thesame.

7.Incombination with the mechanism asf set forth in claim6,.trip'mechanismsubstantially as shown and described whereby the trainsof gearsare automatically declutched: from said shaft at the end of eachstrokeof the table. I

'8. In machine for "cutting, spirallygrooved cams" or the like, a tablefor supporting the blank tobe' cut, means forrotating pris ng spacedlink gears having studs en--' the blankduring the cutting operation,means controlled by a reciprocable' master cam for moving the-table inan arcuate path during the cuttmgoperation, a reclprocable slide shaftand the beddriving 'and blank rotating mechanisms, means for drivingtheshaft in opposite directions during alternate strokes ofthe bed;and'means for engaging ordisengaging said driving meansfrom said "shaft.7 1 9. In combination with mechanism as set forth in claim- 8, tripmechanism whereby said 1 driving means isautomatically disengaged fromsaid shaft atthe end of each stroke "of and a rack mounted on the thetable;

' 10-. -In"almachine for cutting spirally 7 ing the blank to be'cut,means for rotating 'groovedcams or the like,a table for supportthe blankduring the cutting operation, means *controlledby a reciprocable mastercam'for' moving the table in an arcuate path'during cutting operation,areci'pr'ocable slide carrying a-master-cam, a lead ScrW 5 1 crating theslide, and reducing gearing for operating thelead screw, a shaft"disposed" above the-' -bed, a connection betweens'a'id shaft and thebed driving and blank rotate ing mechanisms, agearrotatable'in onedifrom' said rotatable gear, and clutch me'chaf nism whereby the fasttrain or the slow train 1 may be Opera-lively engaged with theflsaidShaft to actuate the same. r

11. a In combination with mechanism as set forth in 'cla'iIn 10, tripmechanism whereby.

said driving -means is automatically disengagedo-from said shaft at' thei end of each stroke of theta-101e ingxthe blank to be out, means forrotating] the blank during the cutting operation, "and '11'5 rectionmounted on said shaft,a slow tram of gearsand a fast tram of gearsd'rlven Q-said rotatable gear,and clutchi mechanism "erating the slide,and, reducing gearing for Y theblank during the-cutting operation,,and.

during the; cutting operation, a shaft. dissaid'shaft andthebedvdrivingandblankromeans .controlledby a1 reciprocable master;

cam for-moving thetable in an arcuate; path during the cuttingoperation, acutter carrying spindle disposed above the table andcariryingta cutter adapted to operate upon the blank while the latter issupported on the table, and gearing for rotating the spindle.

13. In a machine for cutting spirally grooved cams or thelike, aitablefor support- 9; ing the blank to be out, means for rotating the 'blank'during the cutting operation, means controlled, by alreciprocablemaster cam for moving the table an arcuate path during the cutt ngoperation, a reciprocable sl de carrying a master cam, a lead screw .foropthe blank during the cutting operation, and

means for moving the table in an arcuate path during thecuttingoperation, a shaft disposed above the bed, a connection betweensaid shaft andthe bed driving andblank rotating mechanisms, a slow trainof gears and 'a ;fast train .of gears, and means whereby either trainmay be operatively engaged with the said shaft; a spindle disposed abovethe table carrying a cutter adapted to operate upon the blank while. thelatter is supported 1 onthe table, vand gearing for rotating the spindlefrom said shaft.

15. In a machine for cutting spirally" grooved cams orthelikej, a tablefor support- ,-.-ing the blank to be cut, means for rotating meanscontrolled by a reciprocable' master camformovingthe table in an arcuatepath -posedabove the bed, a connection between tating mechanisms, agearrotatable? in one direction mounted on said shaft, aslow train of gearsanda fasttrain of gears driven from whereby the fast trainer the slowtrain. may

be opera-tively; engaged with the said shafttoactuate the same,- aspindle? disposed above thetable carrying a'cutteradapted to oper- 7 ateupon the blank while the latter is supported on the table, and gearingfor rotating the spindle from s'a-idshaft'. I

16. In" a mach" e, for cutting spirally grooved cams or the like, atable for supfportingthe blank to be cut, means for rotating the blankduring the cutting operation, and means controlledby :arecipro'cablemaster cam for moving the table injana'rcuatepath during thecuttingoperation, a rec p'rocable slidecarrying the master cam, a

lead screw 'for opera-ting the, slide, and re ducing gearing foroperatingthe lead screw,

a shaft disposed abovethe bed, aconnection between said shaft and thebed driving and blank rotating mechanisms, a gear rotatable in onedirection mounted on said shaft, a.

slow train of gears and a fast trian of gears. driven; from saidrotatable gear, and clutch mechanism whereby thefast train or the slow.7 train may be operatively engaged with the said shaft to actuate thesame, a spindle disposed abovethe table carrying acutter adapt,- ,c

, ed to operate upon the blank while the latter is supported on thetable, and gearing for rotating the spindle from said shaft 17 In amachine for-cutting spirally grooved cams or the like; a rotatablecutter, a blank holder, a table supporting the blank holder,'means forrotating the blank holder during the cuttingoperation, a recip'roc'ablemaster: cam for moving the table endwise during the cuttlng operation,and means engaged with the table and a relatively fixed member wherebythe table is caused to trav-' erse an arcuate path as it is movedendwise during-the cutting operation.

7 18. In an machi'ne grooved cams or the like; a rotatable cutter, ablank holder, a table for supporting the blank holder,-meansfor-rotating the blank holder during theycutting operation, meanscontrolled by a reciprocable slide for moving the table endwise during;the cutting operation, means engaged with the table and with arelatively fixed-member whereby the'table iscaused to traverse anarcuate path as it 31s moved endwise during the cutting operation, alead screw for operating theslide,-

gearingfor operating thelead screw, a shaft disposed above the bed, aconnection between said-shaft and the beddriving and blank ro- EUGENE IJ. GRUENEWALD.

for cutting spirally 4 'tatin-g mechanisms, and gearing for driving.

the shaft inelther direction;

